Classification of the given substances into elements compounds and mixtures:

Elements: (a) Sodium, (d) Silver, (f) Tin, and (g) Silicon.

Compounds: (e) calcium carbonate, (k) methane, and (l) carbon dioxide.

Mixtures: (b) soil, (c) sugar solution, (h) coal, (i) air, (j) soap, and (m) blood.